package cn.dxj1016.demo02;
import org.apache.commons.io.FileUtils;
import java.io.File;
import java.io.IOException;
import java.net.URL;
import java.util.concurrent.*;

//线程创建方式三：实现Callable接口

/**
 * Callable好处：
 * 1.可以定义返回值
 * 2.可以抛出异常
 */
public class TestCallable implements Callable<Boolean> {
    private String url;
    private String name;

    public TestCallable(String url, String name) {
        this.url = url;
        this.name = name;
    }


    @Override
    public Boolean call() {
        WebDownloader webDownloader = new WebDownloader();
        webDownloader.downloader(url, name);
        System.out.println("下载的文件名为："+name);
        return true;
    }

    public static void main(String[] args) throws ExecutionException, InterruptedException {
        TestCallable t1 = new TestCallable("https://p1.music.126.net/SRzkUrJHjbCqdPKHP-UTDA==/109951165168773497.jpg", "1.jpg");
        TestCallable t2 = new TestCallable("https://p1.music.126.net/SRzkUrJHjbCqdPKHP-UTDA==/109951165168773497.jpg", "2.jpg");
        TestCallable t3 = new TestCallable("https://p1.music.126.net/SRzkUrJHjbCqdPKHP-UTDA==/109951165168773497.jpg", "3.jpg");

//        创建执行服务：
        ExecutorService executorService = Executors.newFixedThreadPool(3);
//        提交执行
        Future<Boolean> r1 = executorService.submit(t1);
        Future<Boolean> r2 = executorService.submit(t2);
        Future<Boolean> r3 = executorService.submit(t3);

//        获取结果
        Boolean rs1 = r1.get();
        Boolean rs2 = r1.get();
        Boolean rs3 = r1.get();

        System.out.println(rs1);
        System.out.println(rs2);
        System.out.println(rs3);

//        关闭服务
        executorService.shutdownNow();

    }
}


//下载器
class WebDownloader {
    //    下载方法
    public void downloader(String url, String name)  {
        try {
            FileUtils.copyURLToFile(new URL(url), new File(name));
        } catch (IOException e) {
            e.printStackTrace();
            System.out.println("IO异常");
        }
    }
}
